Sanding-machine.



J. A. SAGBRDAHL.

SANDING MACHINE.

APPLICATION FILED Nov. z5. 1910.

1,000,296, Patented Aug. 8, 1911.

3 SHEETS-SHEET 1.

z 21247 y@ w J. A. SAGBRDAHL.

SANDING MAGHINE.

APPLIUATION FILED NOV. 25, 1910.

Patented Aug. 8, 1911.

3 SHEETS-SHEET 2.

@Mannion wimm 0 I n v (gw/Mm j JM- aucunes J. A. SAGERDAHL.

SANDING MACHINE.

APPLIOATION FILED Nov.z5. 1910.

1,000,296. l Patented Aug-.8,1911l 3 SHEETS-SHEET 3.

JOHN A. SAGERDAHL, 0F YOUNGSVILLE, PENNSYLVANIA.

SANDING-MACHINE.

Specification of Letters Patent.`

Patented Aug. 8, 1911.

Application illed November 25, 1910. Serial No. 594,000.

To all whom 'it may concern:

V Be it known that I, JOHN A. SAGERQAHL, a citizen of the United States, and resident of Youngsville, in the county of Warren and State of Pennsylvania, have invented new and useful Improvements in Sanding-Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

The invention relates to polishing or abi'ading machines foi' curved surfaces, and the object of my invention 'is to provide a simple and convenient machine for sanding or polishing single and compou nd curved surfaces; and the invention consists in the construction, combination and arrangement of the parts, aslshown'in this specification and the accompanying drawings, and pointed out in the claims.

In the drawings, Figure 1 is aperspective view of the sanding machine .with sanding head raised and the work placed beneath the same ready for start-ing 'the operation of sanding; and Fig. 2 is a similar view showing the sanding machine in operation sanding a round molding. Fig. 3 is a sectional elevation of the sanding head for holding the belt against the work, the pulleys, table,

carriage and O. G. molding being shown in section. Fig. 4 is a top plan view of the upper portion of the machine showing the I pulleys with the sanding belt thereon, the

u er art'of the sanding belt being broken afy. t1?) show the arrangement of the pulleys and belt. Fig. 5 is a plan, view of the carriage. j

Similar numerals refer to corresponding parts in the several views. Q

The numeral 10 indicates the main portion of the` frame, which is formed withthe over-hanging neck 11. A parallel standard or additional portion 12 is provided alongside of the main standard of the frame 1.0 to support the shafts for the driving ulleys and some ofthe pulleys for the abra ing or sanding belt 13. The main frame 10 and standard 12 have a suiciently broad base support the machine.' 0

The sanding or polishing belt 13 1s I nounted upon a plurality of pulleys, as hereinafter described, in order to accomplish the work. The belt 13 is driven by means of the large 4pulley -14 on shaft 15, which shaft/,is mounted in suitable journals upon frame 10 and standard 12, and a steelpulley 116 mounted on shaft 17, which shaft is supported by vplates 18 yon frame 10'and a journal on standard 12. An idler pulley 19 is mounted on a shaft supported in suitable journals in the upper ends of -plates l18.

A take up' pulley 20 is rovided on a disk 21 which disk is mounte and vertical shaft 23 which has a set screw 23 to hold it in position. The disk 21 has a weight slidably mounted on rod 64 on shaft 22 on cross shaft 22 as shown in Fig. 4 to adjust the tension on the belt 13. A pulley wheel 25 is also provided on shaft 22 and has attached thereto the cord or chain 26 which extends to the rear over asecond pulley wheel 27 on shaft 28 0n a' shaft mounted in the upper ends of plates 18 and a weight 29 is attached tothe end of cord 26 so `that it continually draws upon lwheel 25 and shaft 22, the two weights 24 and 29 giving a const-ant and strong tension uponv belt 13 as it draws over pulley 20 on disk 21, and permitting a delicate adjustmentof the tension by the weight 24. The

journalfor cross shaft 22 is mounted on vertical shaft 23 on neck 11 of frame 10 in order 'that pulley 20 may be easilyalined with pulleys 14, 16, and 19 for abrading belt 13.

The pulleys 14 and 16 are rotated by means of a suitable driving belt on pulley 30 which turns shaft 15 and pulley 31. The j pulley 31 is connected byfmeans of the crossed belt 32 with pulleyl 33 on shaft 17, as shown in Figs. 1, 2, and 4. This gives a double drive for the sanding or polishing belt 13, since belt 13 passes around pulley 14 and over steel pulley 16, the rough or abrading side of the belt 13 bearing on the steel pulley 16 so as to give a strong draw on the belt 13, otherwise it would vbe practically impossible to drive the belt 13.

The. abrading belt 13 is held to its work by means of a head 34 which is made preferably in the semi-circular form with a lengthwise slot 35 to support a plurality of varms 36, 37, and 38, by means of suitable iio - down each side of the curved surface, as

and 42 are suicient. to press the belt 13 shown in Fig. 2.

For an O. Gr. surface or one in which there yis a compound curve, the additional arm 38 with pulley 43 revolubly mounted on its lower extremity is provided. The arm 38 with pulley 43 is usually attached to head 34 in slot 35 between bars 36 and 37 and may be given any desired angle in order to'hold belt 13.-to its work upon the oppositely curved surface. The pulley wheel 43 has its periphery preferably covered with felt or a similar substancefor pressing upon the back of the belt 13 in pressing said belt to its work. The pulleys 41 andl 42 are eX- tended beyond and below the edges of the curved surface so as to draw the belt down over the curved edges. e

The head 34 is reciprocatingly raised and lowered by being mounted upon the lower end of a frame composed of rods 44 which are slidably mounted in a plate 45 on part 11 directly over the table 46 on frame 10. The rods 44 are connected at their upper endsby means of a bar 47. The bar 47 is pivotally connected t'o links 48 and 49. The

. link 49 is pivotally attached at 50 to the side .of part 11 of frame 10, and the other end of link 49 is pivotallyl attached to the upper end of a vertical bar 51. At its lower end bar 51 is attached at 52 to the rear end of treadle bar 53. The bar 53 is attached to a portion of framey 10 at 54 and has the plates 55 and 56 on its opposite vends for pedal actuation. I

The table 46 h 'as an opening 57 therein directly beneath head 34 sufficiently large to receive said head and the pulleys thereon. A pair of rollers 58 are revolubly mounted on the opposite sides of opening 57 and eX* tend slightly above the upper surface of the table 46 so that a piece of vmolding will rest upon rollers 58 .and may be easily moved to let the molding or other pieces bear diy rectly upon the rollers 58.

As shown in Fig. 5, carriage 60 is pref` erably made with an opening 65 therethrough for the same purpose as opening 57 in table 46, though this is not always necessaryin the carriage, as it must be moved back and forth upon the tracks 62 in order to sand the full length of a strip. The pin holes 66 are provided in the t'op of carriage 60 for holding the work in place.'

In operating the machine, the frame orv molding 63 to be sanded is placed upon the table 46 beneath and between the pulley wheels 41 and 42. The pedal 56 is then pressed downward, therebyv raising upward on rod 51 and pushing downward rods 44 by vmeans of links 48 and 49.. The head 34 is firmly attached on the lower ends of rods .44, and pulleys 41 and 42 are thereby pressed downward upon belt 13 each side of the oval molding of frame 63, which frame is moved back and forth beneath the rapidly movingbelt 13. It is apparent that any desired adjustment of tension can, be given belt 13 by means of the take-up pulley 20 on disk k21 and the weights 24 and 29 attached to shaft 22 upon which disk 21 is mounted, by sliding weight 24 upon rod 64, in order to quickly and easily adjust the tension on the belt 13. When the sanding is completed the end 55 of pedal bar 53 is pushed downward thereby drawing up on sanding head 34 so Ithat the frame or molding may be quickly and easily slipped from beneath said head.

When it is desired to sand an O. G. molding or molding having compound curves, the arm 38 is attached to head 34 between bars 36 and 37. The carriage 60`may be placed upon table 46 if desired or the three pulleys 41, 42, and 43 may be used -without said carriage. Pulley 43 is adjusted as to the pulleys 41 and 42 and the molding so as to press the belt 13 downintosthe 'reverse curve after which the sanding or polishing head 34 and the remainder yof the mecha-v nism may be used the same as in the case of the two pulleys 41 and 42. over a simple oval frame 63, as hereinbefore described.

It is apparent that this machine would be especially applicable for polishing curved metal surfaces by the use of'a suitable metal abradant upon belt 13, such as emery orl carborundum. y

I claim as' new:

1.- In a polishing or sanding machine, they E combination with an abrading belt, of `a R number of pulleys for controllingthe movement of said belt,'means for applying power to a plurality of said pulleys to "drive said f belt, one ofl the power actuated pulleys bemg located on the rough or abrading sidev l0f, said belt.

rough or abraiding side of said belt, a y

sanding head vertically movable, and a plurality of said pulleys mounted on said sanding head and adjustable at different angles to press said head against the surface to be sanded.

3. In a polishing vand sanding machine, a frame, a plurality of pulleys on said frame and means for actuating said pulleys, an abrading belt on said pulleys, a sanding head vertically movable on said frame, said sanding head having a semi-circular slot therein, a plurality of arms adjustably attached to said head through said slot, and pulleys on said arms tobear against said belt and press said belt at different angles against the surface to be sanded.

4. In a polishing and sanding machine, a frame having an over-hangin portion, a table on said frame beneath sai over-hanging portion having an opening therethrough, a carriage reciprocatively mounted on said table beneath said head having an opening therethrough corresponding to said opening in said table; a frame `vertically slidable on said over-hanging portion above said opening in said-table, means for raising and lowermg said frame, a rubbing or sanding head attached. to the lower end of said frame, a plurality of pulleys mounted on said head to pass up and down said opening in said table, an abrading belt beneath said pulleys on said sanding head, and additional pulleys on said frame for actuating and controlling the movement of said abrading belt, substantially as and for the purpose specified.

In .testimony whereof I have signed my name tothis specification in the presence of two subscribing Witnesses.

JOHN A. SAGERDAHL.

Witnesses:

I; A. ELLsWoR'rH, A. L. FURLOW. 

